Simon myebson



'S. IVIYERSON.

ARTIFICIAL TOOTH.

APPLICATION FILED APR. l1, 1918. RENEWED APR. 7, I9l9.

Patented Oct. 28,1919.

' SIMN ivriinnsomor'cAii/rnrtrncn,MASSACHUSETTS. i

' ARTIFICIAL toorn,

p Specification of Letters Patent.

Patented. occas, Isis.

p Application sied April 17," 191,8,seria1 310,229,033. Renewed April 7,191e. serial no asaeaa v*citizen of the United States, residing atCambridge,in the county of Middlesex and State of Massachusetts, haveinvented new and useful Improvements in Artificial Teeth, of which thefollowing is a specication.

The object of this invention is to provide an artificial tooth of widegeneral adaptability, but particularly adapted lforwtlfie very L' by'Figs. 2, 3, 4' and 5, the mouth portion of troublesome class of casesknown as short bite cases.k The tooth of my invention is particularlydesigned for molar and bicuspid teeth, and is useful in cases where aplastic medium, such as vulcanite formed as a plate, is used as asupport, and also for cases where a non-plastic medium, such as metal,is used, Ythe metal being for example, a

bridge.

The invention is embodied v'in the improve-V ments which I will nowproceed to describe and claim. v

0f the accompanying drawings forming a part of this specilication,-

Figure 1 is a side view of an articial toothV embodying the invention. Y

' Fig. 2 is a plan view of the same, looking toward the support-engagingsurface.

` Fig. 3 is a section on line 3-3 of Fig. 2. Fig. 4 is a view similar toFig. 3, showing in section, a headedV pin engaged with the tooth, andlby dotted lines a portion of a vulcanite plate engaged with the toothand Fig. 5 is a perspective view of the pin shown by Fig. 4. Y ,Y

Figs. 6 and 7 are sectional views of a tooth having al socket, ltheinner portion of which is enlarged. i Y

' Fig. 8 is a sectional view of a tooth adapted to be engaged with ametallic support.V

Fig. 9 is a perspective view of a member including a backing and apinfadapted for A use with the tooth shown by 8.

Fig. 10 is a sectional view, showing the backing and pin illustrated byFig. 9, engaged with the tooth illustrated by Fig.r8. Y

Y rIfhe same reference characters indicate the same parts in all of thefigures.

My improved toothV includes an occlusal portion 12, a buccal portion 13,and a Vbase portion Vhaving a lrentrant Asupport-engaging surfacecomposed of two faces 15 and 16, angularly arranged relatively to eachother.

17 represents a socket opening on the reentrant surface at the junctionof the faces l5 and 16, thereof, and extending into the body of thetooth, the longitudinal axis of said socket Vbeing preferably inclinedrelatively to each of said faces.` 'p )"t` opposite sides of the socket.17 are slot-s 19, opening into the socket and on the faces 15-and 16. y

n the embodiment of the invention shown the socket 17 has a countersunkenlargement 17, which accommodates the head 20a of a metal pin 2Oinserted and cemented in the socket. The inner side of the head E2()a ispreferably spaced from the enlargement 17 a, as shown by Fig. 4. Thehead 20a is adapted to engage a portion of the material of a support,such as a vulcanite plate 2Q, made from plastic material, portions ofthe material while in the plastic condition, being pressed into theslots 19 to form slot-engaging tenons integral with the plate 22 andother portions being pressed into the space between the head 20l and theenlargement 17 a, the result being a secure anchorage of the tooth tothe plate when the latter becomes rigid. The tenon portions of the platematerial entering the slots 19, resist strains tending to turn the toothon the pin 20.

In the embodiment of the invention shown by Figs. 6 and 7, the socketincludes a reduced mouth portion 17b and an inner portion 17c of greaterdiameter than the mouth portion, said inner portion receiving some ofthe plastic plate material and beingV interlocked therewith when thematerial hardens.

The oppositely disposed slots 19, in this embodiment of the invention,extend well into the enlarged portion 17, and serve as vents'for theinclosed air when the plastic material is forced into the socket,thereby Aobviating the necessity of the usual side into said socket andupon said surface and formed to receive tenons on a backing, said.

slots constituting air vents When'the backing is formed from plasticmaterial.

2. An artiicial tooth having an occlusal portion, a buccal portion, abase portion having a rentrant support-engaging surface composed of tWofaces angularly arranged Vrelatively to each other, a socket opening onthe central portion of said surface,` oppositely disposed slots openinginto said socket yand upon said faces, and a .pin secured in said socketand forming a-portion of a tooth support, said pin and socketbeingforined at their outer ends to permit the anchorage of the pin ingasupport formed from plastic material.V j A Y 3. An artificial toothhaving an occlusal portion, a buccal portion, a base portion having arentrant support-engaging surface composed of tvvo faces angularlyarranged relatively to each other, a socket opening on the centralportion of said surface, the mouth portion of said socket beingcountersunk to forni an enlargement, and a pin secured in said socketand having a support-engaging .head spaced from said enlargement.

In testimony *whereof I have affixed my signature.

sIMoN MYnnsoN.

copies of this patient may be obtained for five. cents each, byaddressing Ighe #Commissioner of Patents.

Washington, 1D. G.

